Check your settings in {General Settings} -> {Playback Settings} -> {Fast-Forward/Rewind}
For reference, my (default?) settings in here are as follows:
FF/RW Min Step: 1s
FF/RW Accel: Normal
Otherwise, you really aught to ask in the forum you found that build. As the others have said, there's too many unknowns for us to really get any good troubleshooting done.